LeeSing, A. C., and C. Miles. “The Relative Effectiveness of Audio, Video, and Static Visual Computer-Mediated Presentations”. Canadian Journal of Education/Revue Canadienne De l’éducation, vol. 24, no. 2, June 1999, pp. 212–221, https://journals.sfu.ca/cje/index.php/cje-rce/article/view/2754.